carb heater shut-off valve

[Hammertime]

Is a gas style plastic valve ok, or should it be a metal one? Next question is when I shut the valve off, should it be all the way off? thanks.

 

[grader]

the plastic one should work . i shut the valve completely off when the temps are much above freezing.be aware that on humid days the carbs can ice up with the valve closed.

 

[suprfst]

I have the plastic polaris fuel shut off on mine,works fine.I have it cracked just a little

 

[rx-1 blue reverse]

Is there any real advantage to doind this? I know the SRX and some Doo's have it but how will it help.

 

[tmk50]

Is there any real advantage to doind this? I know the SRX and some Doo's have it but how will it help.

The problem I was having was at high altitudes on warm days when I would stop for a break the sled would have trouble starting. Turns out the hot coolant was heating the fuel in the float bowls so much it was boiling/vaporizing. (high altitude fluids boil at a lower temp due to the reduced atm. pressure)

I installed the shut-off and turned it all the way off - but on cold days where there was lots of humidity the sled would start missing (carbs freezing up)

I ended up just leaving it cracked open a little and never had to touch it all year long.

tk

 

[suprfst]

I had the same exact problem as tmk50,when I went out west.The only time it had ever done it in michigan was on end of the year rides when it was warmer out.

Also I didnt know that fluids boil at a lower point at high altitude,that makes perfect sense though.Explains why i had such a problem with it out west.

 

[suprfst]

Also the cooler fuel and air condeses more making more power,so the more you heat the carbs the less its going to condese the fuel.Minor difference im shure but every little bit helps.

Thats how nitrous works as well.Cold gas condenses the air to allow more air in.Well plus it gives off oxegen in the combustion process.